Ohm + Power
Enter any useful pair. The calculator derives voltage, current, resistance, and power.
Resistor Network
Each branch is a series string. Branch totals are then placed in parallel.
Voltage Divider
Build a resistor ladder with multiple output taps and optional loads on each output.
Series Chain
2 resistorsOutput Loads
1 output tapRLC Impedance
Compare series and parallel RLC behavior at a chosen frequency.
Passive Filters
Estimate frequency response for passive RC, RL, LC, and RLC networks.
Target Helpers
quick design estimatesFrequency Plot
gain responseTiming + Energy
Estimate RC timing, capacitor energy, inductor energy, period, and frequency.
RC Curve
capacitor voltage over timeLED / Diode Resistor
Size current-limiting resistors for one LED, LED strings, or parallel strings.
555 Timer
Calculate astable frequency/duty cycle or monostable pulse width.
Op-Amp Gain
Estimate ideal gain and output for common op-amp configurations.
Regulator Heat
Estimate linear regulator dissipation, efficiency, and junction temperature.
Battery Runtime
Estimate pack voltage, energy, runtime, and load power with regulator efficiency.
ADC / PWM Helpers
Convert ADC counts to voltage and estimate PWM average plus RC smoothing.
Wire / PCB Trace
Estimate copper wire voltage drop and PCB trace resistance/current capacity.
Reactance
Quick capacitive and inductive reactance calculator at a selected frequency.
Resistor Color + E-Series
Decode resistor bands and find nearby standard values.
Power Supply Ripple
Estimate rectifier reservoir capacitor ripple and approximate DC output.
Switching Regulator
Estimate duty cycle, inductor ripple, peak current, output ripple, and rough converter stress.
MOSFET / BJT Switch
Check gate/base drive, conduction loss, switching loss, and transistor switch margins.
dB / Signal Level
Convert voltage gain, power gain, dBm, RMS voltage, attenuation, and impedance-related signal levels.
I2C / Pull-up / Debounce
Estimate I2C pull-up ranges, bus rise time, sink current, and simple RC debounce timing.
Op-Amp Practical Limits
Check gain-bandwidth, slew-rate, output swing, and load-current limits for an op-amp signal path.